Mold for building-blocks.



A. R. GANFIELD.

MOLD FOR BUILDING BLOCKS. APPLICATION FILED MAR. e, 1909.

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A. R. OANPIELD.

MOLD FOR BUILDING BLOGKS.

I 'AP1?LIOATION FILED MAR. 6, 1909.

Patented Jan.21, 1913.

4 SHEETS-SHEET 2.

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APPLICATION FILED MAR. '6, 1909.

Patented Jan. 21, 1913.

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A. R. GANFIELD.

MOLD FOR BUILDING BLOGKKQ.

APPLIOATION FILED MAR. e, 1909.

Patented Jan.21, 1913.

4 SHEETS-SHEET 4.

AUDLEY B. CANFIELD, OF ST. PAUL, MINNESOTA.

MOLD FOB BUILDING-BLOCKS.

Specification of Letters Patent.

Application filed March 6, 1909.

Patented Jan. 21, 1913.

Serial No. 481,751.

To all whom it may concern Be it known that I, AUDLEY R. GANFIELD, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented new and useful Improvements in Molds for Building- Blocks, of which the following is a specification.

My invention relates more particularly to a mold for building blocks in which part or all of its side walls are detachably hinged to the frame of the device and in which the side walls are adapted to be held in closed position by means of a movable yoke frame.

The primary object of my invention is to provide a machine in which concrete building blocks of any suitable shape or construction can be easily, quickly and accurately molded.

Among further objects is to provide a device of its kind which is simple and inexpensive in construction and more effective in use than prior devices.

In the accompanying drawings forming part of this specification Figure 1 is a side elevation of my invention part of the handle and the lock being broken away; Fig. 2 is a plan view of the construction illustrated in Fig. 1; Fig. 3 is another plan view looking down upon the bed of the machine when the upper frame work, sides and mold board are removed; Fig. 4 is a side elevation of the construction illustrated in Fig. 1; Fig 5 is a detail side view of the core, illustrating the construction by which it is fastened to the bed of the machine the latter being shown partly in section; Fig. 6 is a detail side elevation of an alternative construction, the yoke being shown in elevated position and the sides opened, and Fig. 7 is a perspective view of an alternative construction of the yoke.

In the drawings A represents a suitable base or frame having legs 2, a bed 3 secured to said legs by means of bolts 4 and transverse webs 5 which are cast integral with each pair of end legs for strengthening and bracing the frame. These legs, bed and webs form a skeleton base or frame to suport a movable mold board or pallet B upon. which the block is adapted to be molded. This mold board or pallet is divided longitudinally into two horizontal sections 6 and 7 although a single board can be used when desired and the thickness of the mold board varied to suit the conditions for which it is intended. The bed of the machine is provided with a number of guide openings 8 through which projecting rods 9 slide vertically. These rods are mounted upon a carrier 10 which is provided with a longitudinal bar 11 the ends of which are adapted to slide in vertical guide channels 12. Atthe lower portion near each end of the carrier bar 11 are two antifriction rollers 13 which are freely j ournaled between pairs of depending lugs 14 on the carrier bar. Bearing upwardly against these anti-friction rollers are two laterally swinging arms 15 which are carried rigidly upon the crank shaft 16. This crank shaft is journaled loosely in openings 17 in the lower webs 5 and its ends are squared to admit a detachable lever handle 18 on either end by which it can be turned. By turning the handle 18 the thrust rods 9 can be moved up and the mold board raised into superior position to eject a molded block from the machine. A look arm 19 is pivoted by means of the bolt 20 upon the frame and its lower end 21 is adapted to swing into the path of the lever handle 18 and block it when tending to return and thus hold the mold board in elevated position when desired.

The side walls of the mold are formed by front and back plates 22 and 23 and two end plates 24 and 25. The front and side plates 22 and 24 having inner recesses representing the ordinary finished cut stone surface of building rock, are hinged to swing from the vertical position as illustrated in Fig. 6 to open position by means of downwardly projecting hinge bars 26 which are separably hinged at their lower ends upon pintles 27 located in the bed of the machine, said lower ends of said hinge bars being provided with recesses 28 fitting over said pintles. The back and side plates 23 and 25 as illustrated in Figs. 1 and t are rigidly supported in vertical position upon the bed by means of the bolts 29 and upon said back plate is hinged to swing up a yoke 30, the ends ofv which are pivoted upon the back plate by the bolts 31. One end of the yoke frame is formed with an ofiset 32 which acts as a stop to impinge against a portion of the back and hold the yoke in elevated position when thrown back.

The yoke swings down over the outside walls of the front and end plates of the mold and slides against upwardly and inwardly inclined shoulders or ribs 33 which are integral on said plates thus causing the sides of the mold to close into the position illustrated in Figs. 1, 2 and 4. Guards 34 depend from the front portion of the yoke and are turned outwardly at 35 near their lower extremities. These guards impinge against the shoulders on the front wall and cause said wall to swing in while the yoke is descending. The yoke closes tightly over all of the shoulders 33 when in lowered or normal position and holds the walls tightly locked together to form a perfect mold cavity. Adjoining the front and end plates 22 and 24 are upwardly extending leaf springs 36 the lower ends of which are rigidly secured to the bed of the machine by means of bolts 37. The upper ends of these leaf springs play loosely through slots 38 in lugs 39 which are formed on the sides of said plates. These springs tend to swing the plates 22 and 24 outwardly and when the yoke 30 is raised by its handles 40, said plates 22 and 24 are swung out automatically and are supported in outer position by said springs. The ends of the yoke 30 which are hinged to the back plate are resilient to the extent of allowing for the come and go between the end plate 24 and the yoke, the hinge bolts 31 allowing for this movement, The rigid end plate 25 has an upwardly and inwardly tapering flange or rib 41 corresponding with the shoulders 33 so that when the yoke is swung down into closed position, its ends spring over the rib 41 and the shoulders 33 of the hinge bars 26 and hold the end wall 24 closed under spring pressure. The end plates are notched at 45 upon their ends and the back plate notched at 46 to admit the adjacent sides and thus form stop shoulders to limit movement of the swinging sides and assist in holding them in vertical position when the yoke is in normal position.

When desired a core 47 may be secured to the base in the manner illustrated in Fig. 5 such as by means of bolting through the bed the core being provided at as many places as desired with a flange 43 through which bolts such as 44 can be secured. This core may be of any suitable shape desired, the mold board being provided with a customary opening to admit the same. The sides of the mold, when desired, may be provided with guide plates 48 which are secured by bolts 49 and over which core sections 50 are adapted to co-act with the core 47 to-form a continuous air space in the block molded.

The construction of the molding machine may be variously modified to suit conditions for which the machine is intended, the detachable sides being easily and quickly removed and sides of diflerent dimensions and design substituted in their place. The back wall 23 and, the end wall 25 may be separably hinged to the bed in the same manner as the walls 22 and 24 to permit of molding blocks having all four sides finished to imitate cut rook. In Fig. 6 the back wall is shown hinged to the bed although its pintle connection 51 is not separable. In this construction a rigid stop 52 is secured to the bed by the bolt 53 and a padding of soft material 54 secured to the stop to limit the backward movement of the back wall 23 when the yoke is in superior position as illustrated in Fig. 6.

It is not necessary to pivot the yoke upon the back plate as described for it can be constructed in the form of a band as illustrated in Fig. 7, in which case the depending guards 55 act to contract the sides and close them within the yoke and to guide the yoke over the sides. A pair of handles 56 are secured to the frame of the yoke illustrated in Fig, 7 so that it can be easily removed from or placed over the sides when employed.

In operation, the side walls are closed as illustrated in Fig. 2 and held rigidly together by means of the yoke 30. The core 47 projects up into the mold cavity and the mold board or pallet placed on the bed over the core. The wet or moist cement and sand mixture is then filled and tamped in the mold cavity between the walls and the top skimmed oil and finished in the usual manner. The yoke is then lifted out of closed engagement with the side walls by the handles 40 whereupon the hinged walls are antomatically swung out and cleared from the sides of the molded block within the mold by means of-the leaf springs 36. The handle lever 18 is then swung back and the mold board raised into superior position, not shown. The block is thus freed from the core and can be removed from the machine on the pallet in the ordinary manner. The detachable sides which have inner mold faces finished to imitate cut stone, can be changed to mold a block varying in thickness when desired.

In accordance with the patent statutes I have described the principles of operation of my invent-ion together with apparatus which I now consider to represent the best embodiment thereof but I desire to have it v understood that the construction shown is only illustrative and that the invention can be carried out by other means and applied to uses other than those above set forth within the scope of the following claims.

Having described my invention, what I claim as new and desire to protect by Letters Patent is 1. A building block molding machine, comprising, side and end walls, a base to which one of said walls is hinged to swing out, a spring tending to hold said hinged wall in outermost position, a yoke hinged in connection with said wall and coacting with said spring and adapted to close said hinged Wall on its hinge in position to complete a mold and a spring guard depending from the outer portion of said yoke and adapted to come into contact with the outer end of the hinged wall and close the same as the yoke descends; said hinged wall having a separable journal coupling whereby it can be detached from the machine.

2. A molding machine, comprising in combination, a frame, a side Wall journaled on said frame, and having limited motion into open and closed positions, a spring connected with said frame and wall to move said wall into its open position and free a molded block, a yoke hinged in connection with said frame and a guard depending from said yoke and adapted to engage said wall in its open position and move it into its closed position as said yoke descends, whereby a rapid opening and closing of the mold may be secured.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

AUDLEY R. CANFIELD.

Witnesses:

J. T. AVERY, F. G. BRADBURY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

